PACKARD. — TRANSFORMATIONS OP SATURNIAN MOTHS. 553 



of the prothoracic shield still united. The median dorsal tubercle on the 

 8th abdominal segment is nearly twice as thick and somewhat higher 

 than those on each side. Each dorsal tubercle bears 8 or 9 setae, while 

 on each infraspiracular tubercle are from 8 to 12 setae or spinules. 



The body is now black, the sutures between the segments white ; 

 the hinder edge of each segment, beginning with the 2d thoracic, also 

 white. Suraual plate straw-yellow with an irregular longitudinal band, 

 widening behind the two tubercles. J The tubercles orange-yellow, straw- 

 yellow at base. Anal legs entirely black. Thoracic legs and antennae 

 pale at the end; abdominal legs all black. Spiracles black, surrounded 

 by black. It moulted May 22-23. 



Stage IV. Length 23 mm.; at end of the stage 35 mm. The body 

 is now thick and stout, leaf-green. The head is pale straw-yellow, black 

 behind, enclosing a distinct oblong black spot ; clypeus broadly edged 

 with black, making a V. Antennae and clypeus-anterior whitish. 



The dorsal tubercles are all of the same size, and of the same orange 

 color. The spines on those of the three thoracic and 1st abdominal 

 segments somewhat dusky ; those on the tubercles of the segments 

 behind are all pale, while those on the infraspiracular tubercles are a 

 little dusky, as also those of the two dorsal tubei'cles on the suranal 

 plate. The plate is rather smooth, pale straw-yellow, and bearing along 

 and just outside of the edge a hollow triangular black mark with the 

 corners well rounded. Anal legs green, with a similar but larger hollow 

 black subtriangular ring ; the legs below and all the abdominal legs are 

 black with a green spot on the outside of the middle, and bearing long 

 white hairs of even length. 



At the end of this stage, May 28-29, it was 35 mm. in length. Now 

 the tubercles are all deep reddish from the' top to the base, greatly con- 

 trasting with the deep green of the body. The lower edge of the 9th 

 and 10th abdominal segments are now white, forming a broad line. 



The front edge of abdominal segments 3 to 7 whitish. The green 

 spot on the outside of the mid-abdominal legs is now yellow. 



For a day after moulting it nibbled its cast skin. 



It moulted for the fourth time about June 1, and was described 

 June 3. 



Stage V. Length 48-50 mm. Head and body deep pea-green, the 

 head green, with two black lines behind, while the clypeus is lined with 

 black. The head is still small in proportion to the body, being about 

 one-third the width of the latter, and only two-thirds as wide as the 

 prothoracic segment. The prothoracic shield is now smooth, with four 



